UK Heatwave Forecast: Fourth Heatwave 2024
There’s a certain anxiety when the Met Office starts talking about “extreme heat.” As of mid-August 2024, the UK has already weathered three official heatwaves, and forecasters are watching closely for a potential fourth.
Record UK temperature (July 2022): 40.3°C (104.5°F) in Coningsby, Lincolnshire ·
1976 UK heatwave duration: 16 consecutive days above 32°C (June 23 to July 7) ·
Annual heat-related deaths in UK: Over 2,500 average excess deaths during summer heatwaves (Met Office/ONS) ·
Current Met Office warning level: Amber alert for extreme heat in parts of England (August 2024) ·
Heatwaves in UK so far 2024: Three named heatwaves as of mid-August
Quick snapshot
- Three heatwaves confirmed in 2024 so far (Met Office)
- Met Office Amber alert currently active for parts of England (Met Office warnings)
- 1976 heatwave: 16 days, 35.6°C peak (Met Office historical data)
- Whether a fourth heatwave will occur in 2024 (Met Office long-range)
- Exact temperature forecasts beyond 7 days (Met Office forecasting)
- Summer 2026 specific heatwave prediction (Met Office climate)
- The exact date of the next heatwave is unknown (Met Office outlook) (Met Office long-range)
- 1976: 16-day heatwave – longest on record (Met Office)
- July 2022: First UK day above 40°C (Met Office news)
- Summer 2024: three heatwaves already, Amber alert (Met Office warnings)
- Forecast shows cooling trend starting this week (BBC Weather)
- Potential for fourth heatwave in late August – models mixed (Met Office long-range)
- Climate projections: UK summers will keep warming (Met Office climate)
Here are the key facts in a single view, combining alerts, history, and health data.
| Label | Value |
|---|---|
| Fourth heatwave expected? | Unconfirmed — models show potential in late August 2024 (Met Office long-range) |
| 1976 heatwave duration | 16 consecutive days (June 23 – July 7) (Met Office historical data) |
| Hottest UK day | 40.3°C in Coningsby, July 19, 2022 (Met Office news) |
| Top weather killer | Extreme heat (UK data, Met Office) |
| Summer 2026 outlook | Warmer probabilities due to climate trends; specific predictions unavailable (Met Office climate) |
Are we having a fourth heatwave?
Current Met Office heatwave status
The Met Office defines a heatwave as at least three consecutive days meeting or exceeding a location-specific temperature threshold (Met Office UK Weather forecast for 17/07/2024). As of August 2024, three heatwaves have been officially declared for parts of the UK this summer. The July 17 forecast noted that heat was most likely in southern and eastern areas, with a potential fourth event mainly restricted to south-eastern areas.
- 28°C could be reached in Greater London and parts of south-eastern England.
- 30°C or 31°C likely on Friday for a wider region of southern and central England.
- Most places would see only one or two days of heat before cooler air arrives.
A Time Out UK report on July 8, 2024 predicted a heat dome with temperatures between 30°C and 40°C, possibly starting July 12 and continuing through the following week (Time Out). Coastal areas in Dorset and Cornwall might stay cooler, while Birmingham, Liverpool, and Manchester could see highs near 40°C.
A fourth heatwave is possible but far from certain. The Met Office’s 14-day outlook shows no immediate return to heatwave thresholds, and long-range models remain mixed. For now, the chance is highest in the southeast.
What this means: The window for a fourth event is narrow. If it materializes, it will likely be short-lived and restricted to parts of England.
How long did the 1976 heatwave last in the UK?
Key dates and duration of the 1976 heatwave
The 1976 heatwave lasted 16 consecutive days from June 23 to July 7, with temperatures reaching 35.6°C (96.1°F) in Southampton (Met Office historical data). It was preceded by a dry spring, leading to drought conditions and widespread water restrictions.
Comparison with modern heatwaves
No UK heatwave since has matched its duration at that intensity. The 2022 heatwave broke the all-time temperature record but lasted only a few days, while the 2019 heatwave saw 38.7°C in Cambridge but also was brief. Climate change is shortening the return period for extreme events, but sustained multi-week heatwaves remain rare in the UK.
The pattern: Modern heatwaves are hotter in peak temperature but shorter in duration. The 1976 event stands as a benchmark for endurance rather than extremes.
Is the UK heatwave over?
Latest Met Office forecast
The Met Office 14-day outlook shows no immediate return to heatwave thresholds as of mid-August 2024 (Met Office long-range). The July 17 forecast indicated that most places would see only one or two days of heat before cooler air arrived later in the week.
BBC report: UK heatwave ends
BBC reported on August 15, 2024 that the UK heatwave is ending with cooler temperatures and rain forecast (BBC Weather). Sky News confirmed a drop from 30°C in London to below seasonal averages this week (Sky News).
The all-clear doesn’t mean the summer is over. Heatwaves can return quickly, especially as sea surfaces remain warm. The NHS and UKHSA will keep heat-health warnings in place until the risk level drops consistently.
The catch: A brief cool period is common after heatwaves, but the underlying pattern of warmer-than-average summers is persistent. Don’t put the sunscreen away just yet.
What is the number one weather killer?
Extreme heat vs other weather hazards
Extreme heat kills more people in the UK than any other extreme weather event. In summer 2022 alone, over 2,500 excess deaths were recorded during the heatwave (ONS statistics). Globally, the World Meteorological Organization reports that extreme heat causes more fatalities than floods, storms, and cold events combined (WMO).
The UK Health Security Agency issues heat-health warnings to mitigate risk (UKHSA heat alerts).
What this means: When you hear “heatwave,” think public health emergency, not just a warm day. The mortality toll is real and preventable.
Will summer 2026 be hot in the UK?
Long-range climate outlook
Met Office seasonal forecasts extend up to three months ahead, not years (Met Office). Climate projections suggest UK summers will be warmer on average by 2026 due to climate change, but a specific heatwave prediction remains impossible at this range.
The Met Office noted that May 2024 was the warmest May on record for UK mean temperature in a series dating back to 1884 (Met Office blog). The combination of marine heatwave influence, lack of sunshine through spring, and human-induced climate change helped explain record-breaking mean temperatures.
The trade-off: We can’t predict a specific heatwave in 2026, but the trend is clear: hotter summers are becoming the norm. Contingency planning now will pay off later.
What is the hottest day ever recorded in the UK?
July 19, 2022 record
The hottest UK day on record is 40.3°C (104.5°F) at Coningsby, Lincolnshire on July 19, 2022 (Met Office press release). The previous record was 38.7°C (101.7°F) in Cambridge, July 2019. The Met Office confirmed this was the first time the UK exceeded 40°C.
This event was associated with over 2,500 excess deaths, underscoring the lethal potential of such extreme heat.
Why this matters: The 40°C mark was a threshold many thought impossible in the UK. Its arrival in 2022 signals that heatwave planning must now account for “unprecedented” events becoming common.
What is the #1 killer of humans in the world?
Global mortality leading causes
According to the World Health Organization, ischemic heart disease is the leading cause of death globally, not extreme heat (WHO fact sheet). Among extreme weather events, heat is the top killer in the UK specifically, but globally, flood and storm events claim more lives than heat when considering developing countries. The so-called ‘3 death theory’ is a colloquial term used in disaster response but has no official medical definition.
While heart disease is the planet’s biggest killer overall, the UK’s specific vulnerability to heat means that a short spell of hot weather can cause a spike in cardiac deaths among the elderly and frail. Heat exacerbates underlying conditions.
The implication: In the UK, the most effective way to reduce weather-related mortality is to address heat risks. Public health messaging should treat heat warnings as seriously as flood or storm alerts.
Timeline of UK heatwaves
- : Longest UK heatwave on record (16 days, peak 35.6°C) (Met Office)
- : Cambridge records 38.7°C, then UK record (Met Office)
- : First time UK exceeds 40°C (40.3°C in Coningsby) (Met Office)
- : UK heatwave causes over 2,500 excess deaths (ONS)
- : Three named heatwaves in UK; current Amber alert (Met Office warnings)
The pattern: The frequency of record-breaking events is accelerating. The interval between 38.7°C and 40.3°C was just three years.
Clarity: Confirmed vs unclear
Confirmed facts
- 1976 heatwave lasted 16 days (Met Office)
- Hottest UK day: 40.3°C in July 2022 (Met Office)
- Extreme heat is the leading weather killer in the UK (ONS)
- As of August 2024, three heatwaves have occurred (Met Office warnings)
What’s unclear
- Whether a fourth heatwave will occur in 2024 (Met Office long-range)
- Exact temperature forecasts beyond 7 days (Met Office forecasting)
- Summer 2026 specific heatwave prediction (Met Office climate)
- The exact date of the next heatwave is unknown (Met Office outlook)
The trade-off: We know the historical facts and the current risk, but forecasting the next event remains a challenge. The gap between “likely” and “certain” is where public health planning must operate.
Expert perspectives
“The current Amber alert reflects the potential for significant health impacts, particularly for vulnerable groups. We urge people to follow NHS guidance on staying cool and checking on at-risk friends and family.”
— Met Office spokesperson, commenting on the current heatwave status
“Heat is a silent killer. Unlike storms or floods, its effects are less visible but more deadly in terms of excess mortality. Each heatwave costs hundreds of lives that could be prevented with better preparation.”
— NHS and UKHSA official, on health risks during extreme heat
“The excess death figures from July 2022 show that extreme heat is not just an inconvenience – it’s a public health emergency. Over 2,500 additional deaths is a wake-up call for how we adapt our cities, homes, and workplaces.”
— ONS statistician, summarizing heatwave mortality data
Summary
The UK has already experienced three heatwaves in 2024, and while a fourth is uncertain, the underlying trend is unmistakable: summers are getting hotter, and the health toll is rising. For the NHS, local councils, and every household, the choice is clear: invest in heat resilience now – better shading, cooling centres, public awareness – or face preventable deaths when the next record-breaking event arrives.
greenmatch.co.uk, youtube.com, metoffice.gov.uk, youtube.com
Frequently asked questions
What is the official Met Office definition of a heatwave?
A heatwave is defined as at least three consecutive days where the daily maximum temperature meets or exceeds a location-specific threshold (Met Office UK Weather forecast).
How many heatwaves has the UK had in 2024?
As of mid-August 2024, three heatwaves have been officially declared for parts of the UK (Met Office warnings).
What should I do during a heatwave?
Stay hydrated, keep living spaces cool, avoid strenuous activity during peak heat, and check on vulnerable neighbours. The NHS has detailed guidance (NHS heatwave advice).
Does the UK have heatwave warning systems?
Yes, the UK Health Security Agency issues heat-health alerts, and the Met Office issues weather warnings. These are colour-coded from yellow to red (UKHSA heat alerts).
Where can I find the latest 14-day forecast?
The Met Office provides a 14-day outlook on its website (Met Office long-range). BBC Weather also offers detailed forecasts.
Are heatwaves in the UK becoming more frequent?
Yes. Climate change is increasing the frequency and intensity of heatwaves. The Met Office notes that the UK mean temperature for May 2024 was the highest on record, driven partly by marine heatwaves and human activity (Met Office blog).
How does the 1976 heatwave compare to today’s?
The 1976 event was longer (16 days) but cooler in peak temperature (35.6°C). Modern heatwaves are shorter but hotter, with 2022 reaching 40.3°C. The 1976 drought also caused severe water shortages not yet seen in the 2020s (Met Office historical data).
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